关于修改UIWebView的UserAgent

最近在做项目的时候需要修改webView的UserAgent,否则webView不能请求到数据,上网查了一下,其实挺多的,最重要的就是注册默认的UserAgent, 利用registerDefaults即可,下面是源码:

+ (void)initialize {
    [super initialize];
    UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectZero];
    NSString *oldAgent = [webView stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];
    NSString *myAgent = @" xyy";
    if (![oldAgent hasSuffix:myAgent]) {
        NSString *newAgent = [oldAgent stringByAppendingString:myAgent];
        QLLog(@"new agent :%@", newAgent);
        NSDictionary *dictionnary = [[NSDictionary alloc] initWithObjectsAndKeys:newAgent, @"UserAgent", nil];
        [[NSUserDefaults standardUserDefaults] registerDefaults:dictionnary];
    }
}

需要移除的时候只要把最后的自己的agent去掉,然后再注册即可